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. 2014 Aug 18;8:283. doi: 10.3389/fnbeh.2014.00283

Figure 4.

Figure 4

Warm-up – transiently decreased avoidance responding at the start of a session, compared to the end of the previous session or later in the same session – plotted as trial-by-trial responding, averaged over blocks of 3 sessions. (A) Warm-up is exhibited by SD but not WKY rats. Over the first three sessions of acquisition (A1), both SD and WKY rats show increased avoidance responses across trials within a session. Over later session blocks (A2–4), SD rats show warm-up, but WKY rats generally start each session at about the same performance level as at the end of the prior session. Asterisks indicate significantly greater responding in WKY than SD; crosses indicate significantly less responding by SD on the first two trials of a block than on the last two trials of the preceding block. Adapted from Figure 1 of Perrotti et al. (2013). (B) Similarly, warm-up is shown during acquisition by the SD but not WKY model (B1–4). During early extinction sessions (B5,6), the SD model continues to show warm-up: lower response rates at the beginning of a session than at the end of the prior session or later in the same session, even though no shocks are provided during these sessions.